Nusa Penida is an island in the southeast of the Indonesian island of Bali and a district in Klungkung regency that covers the neighboring island of Nusa Lembongan. The Badung Strait separates the island and Bali. The inside of Nusa Penida is hilly with a maximum height of 524 meters. It is drier than the nearby island of Bali. There is little tourist infrastructure.

Nusa Penida covers a wide range of dive sites, including Penida Bay, Lumbung Rock (Manta Point), Meling Stone, Abah Stone, Toya Pakeh and Malibu Point. The flow through the Lombok Strait as a whole is heading south, although the strength and direction of tidal currents are affected by the rainy season.

During the southeast monsoon, tidal currents tend to be south; During the northeast monsoon, tidal currents tend to the north. In the area north of Nusa Penida, the pattern is relatively simple, with flow, in peaktide, about three and a half vertices. The tidal flow in the Badung Strait is semi-diurnal, but the river's character is very complicated as it leads northward to the north of the Lombok Strait as a whole, and the channel has a curved shape.